I have 3 tables :
account
id | name |
---|---|
1 | |
2 | Apple |
custom_field
id | name |
---|---|
1 | Phone |
2 |
custom_field_submission
id | custom_field_id | entity_id | value |
---|---|---|---|
1 | 1 | 1 | 555-444-333 |
2 | 1 | 2 | 111-111-111 |
3 | 2 | 1 | [email protected] |
4 | 2 | 2 | [email protected] |
Expected result after query
id | name | Phone | |
---|---|---|---|
1 | 555-444-333 | [email protected] | |
2 | Apple | 111-111-111 | [email protected] |
I have a query like this :
SELECT
a.id,
a.name,
phone.value as phone,
email.value as email
FROM account a
LEFT JOIN (
SELECT DISTINCT custom_field_submission.value, custom_field_submission.entity_id
FROM custom_field_submission
WHERE custom_field_submission.custom_field_id = 1) AS phone
ON phone.entity_id = a.id
LEFT JOIN (
SELECT DISTINCT custom_field_submission.value, custom_field_submission.entity_id
FROM custom_field_submission
WHERE custom_field_submission.custom_field_id = 2) AS email
ON email.entity_id = a.id
In the reality I have 20 custom fields for 10 000 accounts. Where I run the query It is very slow (3-4 seconds)
Do you have an idea to manage optimize this ?
Thanks.
CodePudding user response:
What you need here is a pivot query:
SELECT
a.id,
a.name,
MAX(CASE WHEN cf.name = 'Phone' THEN cfs.value END) AS Phone,
MAX(CASE WHEN cf.name = 'Email' THEN cfs.value END) AS Email
FROM account a
LEFT JOIN custom_field_submission cfs
ON cfs.entity_id = a.id
LEFT JOIN custom_field cf
ON cf.id = cfs.custom_field_id
GROUP BY
a.id,
a.name;